Multiple impact motor drive for stapling

(19)

(11)

EP 0 799 678 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.01.1998 Bulletin 1998/04

(43)	Date of publication A2:
	08.10.1997 Bulletin 1997/41

(21)	Application number: 96117101.4

(22)	Date of filing: 24.10.1996

(51)	International Patent Classification (IPC)⁶: B27F 7/36, B25C 5/15

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

03.04.1996 US 627300

(71)	Applicant: Hewlett-Packard Company
	Palo Alto, California 94304 (US)

(72)	Inventor:
	Camino, Francisco Javier Zapopan, Jalisco 45060 (MX)

(74)	Representative: Schoppe, Fritz, Dipl.-Ing.
	Patentanwalt, P.O. Box 71 08 67 81458 München 81458 München (DE)

(54)	Multiple impact motor drive for stapling

(57) An electric stapler (11) is provided with current in multiple pulses in order to penetrate a thick stack of paper (47). The stapler (11) is provided with current sufficient to staple a thin stack of paper. If the stapler (11) does not complete its staple function after a time period corresponding to anticipated completion of the cycle, the current is interrupted. The current is then reapplied after the load on the stapler (11) has attenuated. The reapplication of current results in a hammering action. This permits a thicker stack of paper (47) to be stapled with a stapler (11) which is optimized for the thin stack.

Search report